<html>
<head>
  <title>document.write() Example</title>
</head>
<body>
  <p>This is some content that you won't get to see because it will be 
  overwritten.</p>
  <script type="text/javascript">
    window.onload = function(){
      document.write("Hello world!");
    };
  </script>
</body>
</html>
